src/dev/x86/south_bridge/cmos.cc

   1 /*
   2  * Copyright (c) 2004-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Gabe Black
  29  */
  30
  31 #include "dev/x86/south_bridge/cmos.hh"
  32 #include "mem/packet_access.hh"
  33
  34 Tick
  35 X86ISA::Cmos::read(PacketPtr pkt)
  36 {
  37     assert(pkt->getSize() == 1);
  38     switch(pkt->getAddr() - addrRange.start)
  39     {
  40       case 0x0:
  41         pkt->set(address);
  42         break;
  43       case 0x1:
  44         pkt->set(readRegister(address));
  45         break;
  46       default:
  47         panic("Read from undefined CMOS port.\n");
  48     }
  49     return latency;
  50 }
  51
  52 Tick
  53 X86ISA::Cmos::write(PacketPtr pkt)
  54 {
  55     assert(pkt->getSize() == 1);
  56     switch(pkt->getAddr() - addrRange.start)
  57     {
  58       case 0x0:
  59         address = pkt->get<uint8_t>();
  60         break;
  61       case 0x1:
  62         writeRegister(address, pkt->get<uint8_t>());
  63         break;
  64       default:
  65         panic("Write to undefined CMOS port.\n");
  66     }
  67     return latency;
  68 }
  69
  70 uint8_t
  71 X86ISA::Cmos::readRegister(uint8_t reg)
  72 {
  73     assert(reg < numRegs);
  74     switch(reg)
  75     {
  76       case 0x0:
  77       case 0x1:
  78       case 0x2:
  79       case 0x3:
  80       case 0x4:
  81       case 0x5:
  82       case 0x6:
  83       case 0x7:
  84       case 0x8:
  85       case 0x9:
  86       case 0xA:
  87       case 0xB:
  88       case 0xC:
  89       case 0xD:
  90         warn("Reading RTC in the CMOS.\n");
  91         break;
  92       default:
  93         warn("Reading non-volitile CMOS address %x as %x.\n", reg, regs[reg]);
  94         break;
  95     }
  96     return regs[reg];
  97 }
  98
  99 void
 100 X86ISA::Cmos::writeRegister(uint8_t reg, uint8_t val)
 101 {
 102     assert(reg < numRegs);
 103     switch(reg)
 104     {
 105       case 0x0:
 106       case 0x1:
 107       case 0x2:
 108       case 0x3:
 109       case 0x4:
 110       case 0x5:
 111       case 0x6:
 112       case 0x7:
 113       case 0x8:
 114       case 0x9:
 115       case 0xA:
 116       case 0xB:
 117       case 0xC:
 118       case 0xD:
 119         warn("Writing RTC in the CMOS.\n");
 120         break;
 121       default:
 122         warn("Writing non-volitile CMOS address %x with %x.\n", reg, val);
 123         break;
 124     }
 125     regs[reg] = val;
 126 }